<s>
In	O
mathematics	O
,	O
a	O
perfect	B-Algorithm
matrix	I-Algorithm
is	O
an	O
m-by-n	O
binary	B-Algorithm
matrix	I-Algorithm
that	O
has	O
no	O
possible	O
k-by-k	O
submatrix	O
K	O
that	O
satisfies	O
the	O
following	O
conditions	O
:	O
</s>
